//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:
//  Teleportation.
//




#include "doomdef.h"
#include "doomstat.h"

#include "s_sound.h"

#include "p_local.h"


// Data.
#include "sounds.h"

// State.
#include "r_state.h"



//
// TELEPORTATION
//
int
EV_Teleport
( line_t*   line,
  int       side,
  mobj_t*   thing )
{
    int     i;
    int     tag;
    mobj_t* m;
    mobj_t* fog;
    unsigned    an;
    thinker_t*  thinker;
    sector_t*   sector;
    fixed_t oldx;
    fixed_t oldy;
    fixed_t oldz;

    // don't teleport missiles
    if (thing->flags & MF_MISSILE)
    return 0;

    // Don't teleport if hit back of line,
    //  so you can get out of teleporter.
    if (side == 1)
    return 0;


    tag = line->tag;
    for (i = 0; i < numsectors; i++)
    {
    if (sectors[ i ].tag == tag )
    {
        thinker = thinkercap.next;
        for (thinker = thinkercap.next;
         thinker != &thinkercap;
         thinker = thinker->next)
        {
        // not a mobj
        if (thinker->function.acp1 != (actionf_p1)P_MobjThinker)
            continue;

        m = (mobj_t *)thinker;

        // not a teleportman
        if (m->type != MT_TELEPORTMAN )
            continue;

        sector = m->subsector->sector;
        // wrong sector
        if (sector-sectors != i )
            continue;

        oldx = thing->x;
        oldy = thing->y;
        oldz = thing->z;

        if (!P_TeleportMove (thing, m->x, m->y))
            return 0;

                // The first Final Doom executable does not set thing->z
                // when teleporting. This quirk is unique to this
                // particular version; the later version included in
                // some versions of the Id Anthology fixed this.

                if (gameversion != exe_final)
            thing->z = thing->floorz;

        if (thing->player)
            thing->player->viewz = thing->z+thing->player->viewheight;

        // spawn teleport fog at source and destination
        fog = P_SpawnMobj (oldx, oldy, oldz, MT_TFOG);
        S_StartSound (fog, sfx_telept);
        an = m->angle >> ANGLETOFINESHIFT;
        fog = P_SpawnMobj (m->x+20*finecosine[an], m->y+20*finesine[an]
                   , thing->z, MT_TFOG);

        // emit sound, where?
        S_StartSound (fog, sfx_telept);

        // don't move for a bit
        if (thing->player)
            thing->reactiontime = 18;

        thing->angle = m->angle;
        thing->momx = thing->momy = thing->momz = 0;
        return 1;
        }
    }
    }
    return 0;
}

